<template>
  <div>
    <div class="search">
        <input class="search-input" type="text" placeholder="请输入城市名或拼音"
               v-model="keyword">
    </div>
    <div class="search-content" ref="search" v-show="keyword">
        <ul>
            <li class="search-item border-bottom"
                v-for="item in list" :key="item.id"
                @click="handleCityClick(item.name)"
                >{{item.name}}</li>

            <li class="search-item border-bottom" 
                v-show="hasList"
                >没有找到匹配数据</li>
        </ul>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
export default {
  name: 'citysearch',
  props:{
      cities:Object,
  },
  data() {
      return {
          keyword:'',
          list:[],
      }
  },
  methods:{
      handleCityClick(city){
         this.$store.dispatch('changeCity',city)  
         this.$router.push('/')
      }                                          
  },
  computed:{
      hasList(){
          return !this.list.length
      }
  },
 watch:{
     keyword(){
         if(!this.keyword){
                 this.list=[]
                 return
             }
         const result = []
         for (let i in this.cities){
             this.cities[i].forEach((value) => {
                 if(value.spell.indexOf(this.keyword)>-1||       //indexOf() 方法可返回某个指定的字符串值在字符串中首次出现的位置。
                    value.name.indexOf(this.keyword)>-1){           //如果要检索的字符串值没有出现，则该方法返回 -1。
                        result.push(value)
                    }
    
             });
         }
         this.list=result
     }
 },
 mounted() {
     this.scroll=new Bscroll(this.$refs.search)
 },
}
</script>

<style scoped>
    .search{
        padding:  0 .1rem;
        height: .72rem;
        background: #00bcd4;
    }
    .search-input{
        box-sizing: border-box;
         padding: 0 .1rem;
        height: .62rem;
        line-height: .62rem;
        width: 100%;
        border-radius: .06rem;
        text-align: center;
        color: #666;
    }
    .search-content{
        z-index: 1;
        overflow: hidden;
        position: absolute;
        top: 1.58rem;
        left: 0;
        right: 0;
        bottom: 0;
        background: #eee
    }
    .search-item{
        line-height: .72rem;
        padding-left: .2rem;
        background: #fff;
        color: #666;
    }
</style>